Vibrational Spectroscopy Study of Selenate and Sulfate Adsorption Mechanisms on Fe and Al (Hydr)oxide Surfaces

Wijnja, Hotze; Schulthess, Cristian P.

doi:10.1006/jcis.2000.6960

Cited by 253 publications

(231 citation statements)

References 51 publications

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“…Peak [15] further studied selenate and selenite adsorption on to hydrous aluminum oxide, noting that selenate formed outer-sphere while selenite formed a mixture of outer-and inner-sphere complexes. Wijnja and Schulthess [16] also noted that selenate formed mainly outer-sphere associations on aluminum oxide.…”

Section: Introductionmentioning

confidence: 94%

“…The Se-O shell bond distances remained at 1.64 Å while the coordination number remained approximately 4.00 across the pH range studied, suggestive of Se(VI) outer-sphere complexation (see illustration in Table 2). Wijnja and Schulthess [16] showed that Se(VI) adsorption on to Al oxide existed mainly as an outer-sphere complex above pH 6, while Peak [15] suggested that Se(VI) adsorption on a hydrous aluminum oxide, regardless of pH, was as an outer-sphere complex. Others have shown Se(VI) adsorption as inner-sphere complexation [12][13][14], although all of these studies focused on adsorption onto iron (hydr)oxide phases.…”

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confidence: 99%

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Selenium adsorption to aluminum-based water treatment residuals

Ippolito

Scheckel

Barbarick

2009

Journal of Colloid and Interface Science

105

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a b s t r a c tAluminum-based water treatment residuals (WTR) can adsorb water-and soil-borne P, As(V), As(III), and perchlorate, and may be able to adsorb excess environmental selenium. WTR, clay minerals, and amorphous aluminum hydroxide were shaken for 24 h in selenate or selenite solutions at pH values of 5-9, and then analyzed for selenium content. Selenate and selenite adsorption edges were unaffected across the pH range studied. Selenate adsorbed on to WTR, reference mineral phases, and amorphous aluminum hydroxide occurred as outer sphere complexes (relatively loosely bound), while selenite adsorption was identified as inner-sphere complexation (relatively tightly bound). Selenite sorption to WTR in an anoxic environment reduced Se(IV) to Se(0), and oxidation of Se (0) or Se(IV) appeared irreversible once sorbed to WTR. Al-based WTR could play a favorable role in sequestering excess Se in affected water sources.Published by Elsevier Inc.

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Section: Introductionmentioning

confidence: 94%

mentioning

confidence: 99%

Selenium adsorption to aluminum-based water treatment residuals

Ippolito

Scheckel

Barbarick

2009

Journal of Colloid and Interface Science

105

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“…The spectrum of HT-SO 4 was also similar to the spectrum of the Na 2 SO 4 solution, and only a slight shift to a higher wavenumber was detected. However, it has been reported that when SO 4 ions are in direct combination with metal atoms, the symmetric vibrations (ν 1 ) of SO 4 exhibit infrared activity at around 975 cm -1 , and the antisymmetric stretching vibrations (ν 3 ) of SO 4 are divided into two or more peaks [19][20][21].…”

Section: Characteristics Of Rehydrated Ht and Ht With Adsorbed Anionsmentioning

confidence: 99%

Surface complexation reactions of inorganic anions on hydrotalcite-like compounds

Morimoto

Anraku

Hoshino

et al. 2012

Journal of Colloid and Interface Science

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Complexation reactions of environmentally important inorganic anions such as nitrate, chloride, sulfate, arsenate, and phosphate on the surface of hydrotalcite-like compounds (HT) were investigated to understand the role of HT in the immobilization of hazardous anions in an alkaline environment. The effects of surface complexation reactions on the solid state properties of HT were also evaluated to understand their stability. Synthetic HT was used for the adsorption and post-adsorption experiments. The obtained adsorption isotherms showed that the order of selectivity of HT for anions was NO 3 < Cl < SO 4 << AsO 4 < PO 4 . To distinguish the adsorption mechanisms (inner-sphere complexes or outer-sphere complexes) of these anions, zeta potential measurements and infrared absorption spectroscopic analysis were performed.The results indicated that NO 3 and Cl were adsorbed as diffuse ions on the outer surfaces of the HT, while SO 4 formed outer-sphere complexes with a strong electrostatic interaction. Moreover, AsO 4 and PO 4 formed inner-sphere complexes via a ligand substitution reaction on the HT surfaces. And it was suggested that oxyanions with low ionic potential, such as AsO 4 and PO 4 , had a tendency to form inner-sphere complexes with the HT surfaces. The formation of inner-sphere complexes shifted the isoelectric point and the surface charge of the HT.Furthermore, the solubility of the HT was reduced by the inner-sphere complexes with PO 4 and AsO 4 . It was revealed that the formation of inner-sphere complexes on the HT surfaces contributed to the stabilization of the HT, as well as a decrease in the mobility of these anions.

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“…Th e introduction of attenuated total refl ectance FTIR (ATR-FTIR), cylindrical internal refl ectance FTIR (CIR-FTIR), and diff use refl ectance infrared Fourier transform (DRIFT) has allowed us to probe in situ into the solid-liquid interface of adsorbed inorganic compounds, such as SeO 4 2− , SO 4 2− , and CO 3 2− on Fe and Al oxides (Wijnja and Schulthess, 1999, 2000a,b, 2001Suarez, 1995, 1997;TejedorTejedor and Anderson, 1990;Zeltner and Anderson, 1988). Comparing ATR with CIR, the ATR methods allow greater solids concentration on the sample holder and, therefore, yield cleaner spectra.…”

Section: Infrared Spectrophotometersmentioning

confidence: 99%

Historical Perspective on the Tools That Helped Shape Soil Chemistry

Schulthess

2011

Soil Science Society of America Journal

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SSSA 75 th Anniversary Paper T he tools of soil chemistry include instruments, mathematics, models, and software. Th ere is also the mind and imagination. Th roughout the history of our science, we have been shift ing away from a very labor-intensive laboratory environment, where long hours of concentration on tedious tasks was the norm. Th is change in the way we work has been accelerating, particularly since the 1950s. We are accomplishing more work but with less eff ort and more time to contemplate what the data are trying to tell us. Th e essence of our research activity has changed dramatically.Numerous laboratory tools have been used in soil chemistry during the last 200 yr, and the major changes that have occurred are highlighted here. It is hoped that the picture presented will help us decide how to better train our students for the future. By knowing how we have changed in the past and how we appear to be changing in the present, we can perhaps trace the path that we are taking, at least in the near future.Eight major themes are addressed here:1. Th e early years reviews the research environment of the 1800s up to the early 1900s. It marks the beginning years of soil chemistry that shaped many of our ideas for the decades that followed.2. Th e age of electronics covers the early part of the 1900s and the origins of the fi rst portable meters on the market.3. Spectroscopy is at the core of most of our modern methods of analysis. While the development of only a few tools are described here, the impact of spectroscopy on our current research activity cannot be understated.

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Vibrational Spectroscopy Study of Selenate and Sulfate Adsorption Mechanisms on Fe and Al (Hydr)oxide Surfaces

Cited by 253 publications

References 51 publications

Selenium adsorption to aluminum-based water treatment residuals

Selenium adsorption to aluminum-based water treatment residuals

Surface complexation reactions of inorganic anions on hydrotalcite-like compounds

Historical Perspective on the Tools That Helped Shape Soil Chemistry

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